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implement codegen support for most unary operators when

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initializing a global.  This handles important cases like:
float foo3 = -0.01f;

llvm-svn: 45427
This commit is contained in:
Chris Lattner
2007-12-29 23:43:37 +00:00
parent 6787a45a65
commit a77acbdcae
1 changed files with 36 additions and 1 deletions
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37
clang/CodeGen/CodeGenModule.cpp
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@@ -424,7 +424,42 @@ static llvm::Constant *GenerateConstantExpr(const Expr *Expression,
case Stmt::CastExprClass:
return GenerateConstantCast(cast<CastExpr>(Expression)->getSubExpr(), type,
CGM);
case Stmt::UnaryOperatorClass: {
const UnaryOperator *Op = cast<UnaryOperator>(Expression);
llvm::Constant *SubExpr = GenerateConstantExpr(Op->getSubExpr(), CGM);
// FIXME: These aren't right for complex.
switch (Op->getOpcode()) {
default: break;
case UnaryOperator::Plus:
case UnaryOperator::Extension:
return SubExpr;
case UnaryOperator::Minus:
return llvm::ConstantExpr::getNeg(SubExpr);
case UnaryOperator::Not:
return llvm::ConstantExpr::getNot(SubExpr);
case UnaryOperator::LNot:
if (Op->getSubExpr()->getType()->isRealFloatingType()) {
// Compare against 0.0 for fp scalars.
llvm::Constant *Zero = llvm::Constant::getNullValue(SubExpr->getType());
SubExpr = llvm::ConstantExpr::getFCmp(llvm::FCmpInst::FCMP_UNE, SubExpr,
Zero);
} else {
assert((Op->getSubExpr()->getType()->isIntegerType() ||
Op->getSubExpr()->getType()->isPointerType()) &&
"Unknown scalar type to convert");
// Compare against an integer or pointer null.
llvm::Constant *Zero = llvm::Constant::getNullValue(SubExpr->getType());
SubExpr = llvm::ConstantExpr::getICmp(llvm::ICmpInst::ICMP_NE, SubExpr,
Zero);
}
return llvm::ConstantExpr::getZExt(SubExpr, Types.ConvertType(type));
//SizeOf, AlignOf, // [C99 6.5.3.4] Sizeof (expr, not type) operator.
//Real, Imag, // "__real expr"/"__imag expr" Extension.
//OffsetOf // __builtin_offsetof
}
break;
}
case Stmt::ImplicitCastExprClass: {
const ImplicitCastExpr *ICExpr = cast<ImplicitCastExpr>(Expression);